|At that price range, its tough to go wrong. From the photos, it looks to be in decent shape. The engine looks to have some type of additional pump added to it (maybe freshwater cooling?) and by the looks of the rust on it, may have seen better days. Check the decks carefully and look for spiderweb cracks or deck delamination by sound the deck for hollow areas or using a moisture meter. Really, a survey may be worthwhile.
It looks as though you have enough sails to get out in fair conditions, but you may want to look at their age/condition also.
Good luck! I've got a '76 also, it was a great year!
Mark 3, Hull #636